Photographic color-print and process of producing same.



W. F. FOX.

PHOTOGRAPHIC COLOR PRINT AND PROCESS 0F PRODUCING SAME. ADPLICAHON FILEDMAR.11,1914.

l 9 1l 66 12 l Patented Dec. 28, 1915.

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@Lf if Fiegl E 1T' H W/TA/ESSE lin 'WILLIAM FRANCIS Fox, or NEW YORK, N.

man amarres r. Nr onirica.

Y., ASSIG-NOR, BY DIRECT .AND MESNE ASSI(SrNMElN'IS, 0F TWO-THIRDS TOKINEMACOLOR COMPANY OF AMERIC, 0E NEW YORK, N. Y., A CORPORATIONDELAWARE.

PHOTOGBPHIC COLOR-PRINT -ANI) PROCESS OF BRODUCING SAME.

Specification of Letters Patent.

rammed neces, mia.

Application filed March 11, 1914.. Serial No. 823,897.

To all whom t may/concerne:

Be it known that I, WILLIAM FRANCIS FOX, a subject of the King of GreatBritain, and a resident of Beechhurst, in the borough of Queens, cityand State of New York, have invented certain new and useful Improvementsin .Photographic Color- Prints and Processes of Producing Same, of whichthe following is a specification.

'Ihe object of the invention is to produce photographs in substantiallythe natural colors of the original objects or scenes. Such invention isadapted for the production either of single color-photographs or ofextended series thereof capable of use, for

example, in a suitable projecting-machine.-

My invention relates chiefiy to improved processes for producingphotographic color prints.

It also. comprises a photographic color print as an article produced byone form of my improved process.

In carrying out the invention, I make a photographic negative, inmonochrome, containing two images of a scene or/pbject. 'Ihese imagesare taken through suitable color-filters, one being preferably green andthe other red. As a result of the use of these filters, one of saidimages will faithfully represent the subject-matter photographed, savethat all red color-sensations will have been eliminated. In the otherimage, the subject-matter has also been vfaithfully portrayed, save thatgreen colorsensations haveT been eliminated. From the negative soobtained, I make a positive print, and such negative and positive arethen used in-the production of two additional negatives, which aresubsequently used for reproducing one of the two images in positive formin such manner that the image printed from one of said additionalnegatives may be supplied with color, while the image printed from theother negative I may be used to correct the positive image last referredto with respect to color gradations.

The invention is illustrated in the accompanying drawing, which ismainly diagrammatic.

In said drawing, Figure 1 is a plan view illustrating a negative film,and Fig. 2 a similar View of the positive film made therefrom, theseportraying two crosses, one (the a green color-filter, and the lowerimage through a red color-ilter.'= Figs. 8, 4 and 5 are plan views,illustrating the production of what I term a color-negative, z'. e., anegative made from the green image of the negative shown in Fig. l andthe red image of the positive shown in Fig. 2. Figs. 6, 7 and 8 are planviews, illustrating the production of what I term a f monochromenegative, z'. e., a negative in blackand-white made, by superimposedprinting, from the red image upon the positive (Fig. 2) and from thelgreen image upon the positive (Fig. 2). Fig. 9 is an edge view of asection of lm provided with a coating of emulsion on each side thereof.Fig. 10 is printed from the monochrome negative l (Fig. 8).

In the practice of the process under disclosure, I proceed 'rst, asabove indicated, to produce a negative film of not less than tvvoimages, using for this purpose preferably, although not necessarily, aconsecutive-view camera provided with green and red color-filters whichare successively brought before the aperture. As a result, what I shallterm herein the green image is an image of the subject matter,l fromwhich, however, red color-sensations have been eliminated, while what Ishall. term herein the red image is an image of the subject matter, fromwhich, however, green color-sensations have been eliminated. To aid inthe disclosure, I have assumed in the drawing that the subject-matterphotographed comprised a white background and two crosses side byside,'one of these (the left) being of red color and the other of green.The negative film A (Fig. l), after being .developed and fixed in theusual manner, is 'used for the production, by the usual rinting practiceif desired, of a positive film B (Fig. 2). The negative and positivefilms so produced and which may, as above indicated, contain either twoor a greater number of images, are 'utilized .for the production of whatI term a colornegative and a monochrome negative, and by means of theseis produced the positive constituting the finished product under thisinvention.

In producing the color-negative, I proceed as follows: In the firstplace, it will be understood, as above indicated, thatin the finishedproduct hereinafter described, the colors, on the image produced by theuse of the color negative, representing the natural colors of the objectphotographed, are to be supplied by subjecting such image to the actionof green and red coloring solutions, one of these'being preferably achemical reagent and the other a dye. It is desirable that in theimagesubjected to this treatment those. portions adapted to take up thegreen color shall be represented by the silver deposit, and thatthosefportions designed to take up the red color shall be represented bysubstantially clear gelatin.' IVhite and intermediate colors will beyrepresentedby both silver deposit and gela: tin, but in varying quantityof the former, as a result whereof themportions so colored will take upto a sufficient extent for the* purpose named .either the green or thered.

Using the green image (Jr of the negatlve A, I first obtain: a4 printtherefrom, 1nd1- cated at C (Fig. 3). Here the green cross (at theright, Fig. l) appears white, the red cross (at the left, Fig. l)appears dark,

and the background is substantially clear.

Immediately over this image C, I print (see Fig. 4)^the imagevof the redpositive (-R, Fig. 2), the lines of the images being, o f course, inperfect registry. As a result', the

red cross appears more intensely dark, the

green cross remains white, and the background is gray. rIhis isaccomplished by regulating the time of expdsure. As a vresult of theprinting of the superimposed green negative image and red positive image(Figs. 3 and 4), I produce the color-negatiye D, (Fig. 5) in which thecolor gradatins-are directly opposite those which it is;v designed toproduce on the finished product. In such color-negative, the backgroundred cross is intensely dark.-

Having produced the color-negative, I now produce anothernegative,ptermed herein the monochrome negative, since in the :is gray,the green^cross is white, and the practice of the invention hereindisclosed it is proposed that the ultimate positive print shall be, inpractical effect, a composite consisting of a. reproduction from thecolor-negative, modified or graded` however, by a reproduction from anegative in black-and-white. I proceed as follows Using the red positive(R, Fig. 2), I obtain a print E (Fig. (i) upon a film or other suitablesubstance. I-Iere the background is gray, the green cross is clear,while the red cross lalso is gray. Next, using the green the monochromenegative H, I

positive image, (G, Fig. 2) I .print the same (F, Fig. 7) directly overthe print E (Fig. 6) made from' the red positive image. In printing fromthe red positive R and the green positive G, I give each about one-halfthe normal or usual exposure. In effect, therefore, the two exposuresequal one normal or usual exposure. The resultant image H (Fig. 8),constituting what I call the monochrome negative, has thesecharacteristics The background having been doubly printed issufficiently dark to prevent an exposure being made through it in thesubsequent printing step about to be described, while the two crossesare somewhat lighter, in order to permit these to be imprinted, duringthe next step of the process, upon the final film. o y

As-previously explained, the image printed by the color-negative uponthe final positive is subjected to color treatment, but the necessarycolor gradations not being present, correction, asby means of amonoprint from the color-negative may be impressed upon this, and then,after such print has been colored, the surface of the film may beWaterproofed and over such waterproofed surface thev film may bere-emulsioned and a print from the monochrome ne ative impressed thereonin precise registry with thel color-image. I prefer, however, to followa somewhat different procedure, involving the use of a film having acoating of emule sion on both sides thereof, as illustrated at I, Fig.9. I y Y By suitable means, as by direct printing, and using thecolor-negative D, I obtain a lprint therefrom on one of the emulsionedsurfaces of the film I, the exposure being so regulated that theemulsion on the other side of said film will not be affected. Bysimilar, or other desirable, means, and using obtain a print therefrom(regulating the exposure as above'explained) on the emulsioned surfaceof the film I opposite the surface upon which a print has been impressedby means of .the color-:negative D, being careful to observe that theprints formed by the use of both negatives are in perfect registry. Theprint"obtained from the color-negative is illustrated in Fig. 10, whilethe print obr'tained from the monochrome negative is illustrated in Fig.11. The film bearingan image on either lside thereof is now ready fordevelopment, and

this may be accomplished by immersion in a suitable bath, developmentproceeding on both sides thereof simultaneously. After green bath. Asuitable bath may be compounded of the following constituents Vanadiumchlorid 20 grains Ferrie ammoniumoxalaten- 10 Ferrie chlorid 10Potassium ferricyanid 20 Glacial acetic acid l0 minime Oxalic acid 100grains Water sufficient to make the total composition twenty ounces.

Immersion of the film in this bath for five minutes will ordinarily besuicient. After it has been removed from such bath, it may be washed toremove superfluous materials,'after which to clear the image and make itmore transparent it is immersed in an ordinary acid Xing bath, such asis commonly employed, and in this it is allowed to remain for a suicienttime to accomplish the purpose stated. Upon removal therefrom, the filmmay be washed sufficiently to remove sodium thiosulfate. The film isthen immersed in a bath containing a suitable red dye, for instance ananilin dye, and in this bath it is allowed to remain until any whiteobject in the image shows white. 'lhe remaining colors will then be ofcorrect intensity. After removal from the bath, the ilm may be rinsed tore move superfluous red dye, after which it is driedand the process isthen complete.

Throughout the foregoing specification, l have referred to theemulsion-bearing surface as a ilm, but it will, of course, be apparentthat glass plates may be employed, particularly where the finishedpicture isA to be used as a transparency. llt will also be apparent thatwhile the process is adapted forutilization to produce a single discreteprint, it is also admirably adapted for use in consecutive-view colorphotography. In this, the common practice of employing color-filtersduring the projection of the pictures upon a screen is dispensed with,since the colors are carried by the film itself. Also, the number ofimages necessary to produce an exhibition in color of given length isreduced by one-half, as compared with processes now in use since but oneiinished projecting positive picture will result from two images uponthe original' negative.

Having now described my invention, what l claim as new therein anddesire to secure by Letters Patent is as follows:

1. VA photographic vprocess involving the production of a negative oftwo images from one of which certain color sensations have been omittedand from the other 'of which certain other color sensations have beenomitted, obtaining a positive print from said nega ive on transparent ortranslucent material, producing byl means of'said negative and positivea second negative, obtaining a positive print from said second negative,obtaining from said first named positive print a third negative andimpressina upon sensitized material a print from each of said second andthird negatives in registry with each other, substantially as set forth.

2.l A photographic process involving the production of a negative of twoimages from one of which certain color sensations have been omitted andfrom the other of which certain other color sensations have beenomitted, obtaining a positive print from said negative on transparent ortranslucent material, producing a second negative by the use of thatimage of the original negative from which certain color sensations havebeen omitted and that image of said positive print from which othercolor sensations have been omitted, obtaining a. positive print fromsaid second negative, obtaining from said first named positive print athird negative and impressing upon sensitized material a print from eachof saidsecond and third negatives inyregistry with each other,substantially as set forth.

3'. A photographic process involving the production of a negative of twoimages from one of which certain color sensations have been omitted andfrom the other of which certain other color sensations have beenomitted, obtaining a positive print from said negative kon transparentor translucent .maf terial, producing by means of said vnegative andpositive a second negative, obtain' ing from said first named positivev`print a third negative, printing from said second negative uponsensitized material, printing on said material in registry with theprint so obtained the image of said third negative and coloring one ofthe prints from said last named negatives, substantially as set forth.4. A photographic process involving the production of a negative of twoimages from one of which certain color sensations have been omitted andfrom the other of which certain other color sensations have beenomitted, obtaining a positive print from said negative on transparent ortranslucent material, producing by means of said negative and positive asecond negative, ob-

taining from said first named positive print a third negative, printingfrom said second negative upon one side of a surface which has beensensitized on both sides, superimthe print so obtained, but on the theimage of posing on opposite side of said surface,

said third negative and coloring one of the prints made from said lastnamed negatives, substantially as set forth. l

5. A photographic process involving the production of a negative of twoV"images from one of which certain color sensations have been omitted.and from the other of which certain other color sensations have been(omitted, obtaining a positive print from said negative on transparent ortranslucent material, producing by means ofsald negative and positive asecond negative, obtaining from said first named positive print a thirdnegative, printing from said second negative upon one side of a surfacewhich hasbeen sensitized on both sides, superimposing onthe print soobtained, but on the opposite side of said surface, the image of saidthird negative, developing both prints, protecting one of them, bywaterproong, and coloring the stantially as set forth.

6. A photographic process involving the production of a negative of twoimages from one of which certain' color sensations have been omitted andfrom the other of which certain other color sensations have beenomitted, obtaining a positive print from saidnegative on transparent ortranslucent material, producing by'means of said negative and positive'asecond negative, obtaining from said i-rst named ositive print a thirdnegative, printing frodi said second negative upon one side of a'surface which has been sensitized posing on the4 print opposite side of(on both sides, superimso obtained, but on the said surface, the imageof said third negative, developingboth prints,

prints, protecting one of protecting one of them by waterproofing, andcoloring the lunprotected print by immersing it in color baths,substantially as set forth. j

7. A photographic process involving the production of a negative of twoimages from one of which certain color sensations have been omitted andvfrom the other of which certain .other colorsensations have beenomitted, obtaining a positive print fromsaid negative Aon transparent ortranslucent, material, producing by means of said negative and tive,obtaining from said iirst named positive print a third negative,printing from said second negative upon one side of a surface which hasbeen sensitized .on\ both sides, as by gelatin-silver emulsion,superimposing on lthe print so obtained, but on the opposite side ofsaid surface, the image of said third negative, developing both them,proofing, and subjecting the other tosolutions one of which will colorthose portions of the,print represented by silver deposit other, sub-vpositive a second nega-- by water- 1 a third negative, printing fromsaid second negative upon one side of a surface which has beensensitized on both sides, superimposing on the print so obtained, but onthe opposite side of said surface, the image of said third negative,developing both prints, protecting one of them by Waterproofing, andsubjecting the other to treatment in a toning bath and a dyeing bath,substantially as set forth.

9. A photographic productionl of -a negative of two images from one ofwhich certain color sensations have been omitted and from the other ofwhich certain other color sensations have been omitted, obtaining apositive print from said negative on transparent or translucentmaterial, producing by means of said' negative and positive a secondnegative, obtaining from said first "named positivo print a thirdnegative, printing from said second negative upon one side of a surfacewhich has been sensitized on both sides, superimposing on the print soobtained, but on the opposite side of said sur- `face, the image of saidthird negative, de-

' other to treatment in suitably compounded green toning and red dyebaths, these producing, in the finished print, colors approximatelygreen and red, substantially as set forth.

10. A photographicprint of transparent or translucent material, coatedon both sides, each side bearing a photographlc image, one being amonochrome print, and the other a color print, having colorscorresponding to the color elements of the object photographed,. saidprints representing the same object and belng 1n registration with eachother, and said monochrome print having a Waterproof transparent coatingover the same, substantially as set forth.

.This specification signed and witnessed this 9th day of March, 1914.

WILLIAM FRANCIS FOX.v Witnesses:

S. '0. EDMoNDs, l

I. MCINTosH.

process involving the

